I wouldn’t say that any specific skill (like literacy) is required to have intelligence. It’s more the capability to learn skills and build a model of the world and the people in it using abstract reasoning.
Otherwise we would have to say that pre-literacy societies lacked intelligence, which would be silly since they are the ones that invented writing in the first place!
We are approaching situation, where AI will make most decisions, and people will wear it as a skin suit, to fake competency!